linux-kernel - Re: ARM64: hibernation: How to use hibernation/suspend-to-disk on ARMv8?

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Message-ID: <20150112115415.GB14519@red-moon>
Date:	Mon, 12 Jan 2015 11:54:15 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	George Bush <georgebush815@...il.com>
Cc:	"sebastian.capella@...aro.org" <sebastian.capella@...aro.org>,
	"Russ.Dill@...com" <Russ.Dill@...com>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"len.brown@...el.com" <len.brown@...el.com>,
	"nico@...aro.org" <nico@...aro.org>,
	"santosh.shilimkar@...com" <santosh.shilimkar@...com>,
	Will Deacon <Will.Deacon@....com>,
	Jonathan Austin <Jonathan.Austin@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
	"sboyd@...eaurora.org" <sboyd@...eaurora.org>,
	"victor.kamensky@...aro.org" <victor.kamensky@...aro.org>,
	"r.sricharan@...com" <r.sricharan@...com>,
	"liuj97@...il.com" <liuj97@...il.com>,
	"lauraa@...eaurora.org" <lauraa@...eaurora.org>,
	"zhou0283@...il.com" <zhou0283@...il.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: ARM64: hibernation: How to use hibernation/suspend-to-disk on
 ARMv8?

On Sat, Jan 10, 2015 at 03:14:33PM +0000, George Bush wrote:
> Hi all
> 
> I notice we have hibernation.c in arm/kernel, however, I don't find it in arm64.
> Does it mean arm64 do not support hibernation/suspend-to-disk function?

Yes, not at the moment, but we have planned to implement it.

> I tried some path to search the reason, but found nothing, they all say arm64
> has the backward compatibility. So I send this email to the community and
> hope to get the reason.
> Thanks!
> 
> I ported the arm hibernation.c to arm64/kernel(with LP64), but failed in a
> strange way. When I do resume, the arch_restore_image() get a page_fault
> when it calls the copy_page(), like:
> "Unable to handle kernel paging request at virtual address 0xffffffbc055c3fa8"
> I'm sure the copy_page()'s parameters is in the memory area, why and how
> I get the strange address 0xffffffbc055c3fa8?
> 
> vmalloc:         0xffffff8000000000 - 0xffffffbb00000000
> vmemmap:     0xffffffbc01400000 - 0xffffffbc04f88000
> modules:       0xffffffbffc000000   -  0xffffffc000000000
> memory:        0xffffffc000000000 - 0xffffffc0be800000
> 
> 
> Look forward to your reply, thanks!

We need your patch, kernel version, config file, your board/SoC HW details
before even assuming what is happening. Please provide them and I
am happy to help you implement suspend-to-disk on arm64 properly.

Thanks,
Lorenzo
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